import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";

// Stub next/cache.unstable_noStore — vitest runs outside Next's runtime
// so the real implementation throws ("called outside a Server
// Component"). The function is a no-op for our purposes (it tells Next
// not to cache; in a unit test there is no cache to opt out of).
vi.mock("next/cache", () => ({
  unstable_noStore: () => {},
}));

import { getRuntimeConfig } from "./runtime-config";

describe("server getRuntimeConfig (shell)", () => {
  const ORIGINAL_ENV = { ...process.env };

  beforeEach(() => {
    for (const k of [
      "BASE_URL",
      "POSTHOG_HOST",
      "NEXT_PUBLIC_BASE_URL",
      "NEXT_PUBLIC_POSTHOG_HOST",
      "NODE_ENV",
    ]) {
      delete (process.env as Record<string, string | undefined>)[k];
    }
  });

  afterEach(() => {
    Object.assign(process.env, ORIGINAL_ENV);
  });

  it("returns env values when all are set (production)", () => {
    (process.env as Record<string, string>).NODE_ENV = "production";
    process.env.BASE_URL = "https://showcase.copilotkit.ai";
    process.env.POSTHOG_HOST = "https://eu.i.posthog.com";
    expect(getRuntimeConfig()).toEqual({
      baseUrl: "https://showcase.copilotkit.ai",
      posthogHost: "https://eu.i.posthog.com",
    });
  });

  it("strips trailing slashes", () => {
    (process.env as Record<string, string>).NODE_ENV = "production";
    process.env.BASE_URL = "https://showcase.example.com/";
    process.env.POSTHOG_HOST = "https://eu.i.posthog.com//";
    const cfg = getRuntimeConfig();
    expect(cfg.baseUrl).toBe("https://showcase.example.com");
    expect(cfg.posthogHost).toBe("https://eu.i.posthog.com");
  });

  it("falls back to dev defaults when unset in non-production", () => {
    (process.env as Record<string, string>).NODE_ENV = "development";
    const cfg = getRuntimeConfig();
    expect(cfg.baseUrl).toBe("http://localhost:3000");
    expect(cfg.posthogHost).toBe("https://eu.i.posthog.com");
  });

  it("falls back to sentinel and console.errors in production (BASE_URL only)", () => {
    (process.env as Record<string, string>).NODE_ENV = "production";
    const errs: string[] = [];
    const spy = vi.spyOn(console, "error").mockImplementation((m: string) => {
      errs.push(m);
    });
    const cfg = getRuntimeConfig();
    spy.mockRestore();
    expect(cfg.baseUrl).toBe("about:blank#shell-base-url-missing");
    // POSTHOG_HOST falls back silently (analytics key — legitimately absent in some envs).
    expect(cfg.posthogHost).toBe("https://eu.i.posthog.com");
    expect(errs.some((m) => m.includes("BASE_URL"))).toBe(true);
    expect(errs.some((m) => m.includes("POSTHOG_HOST"))).toBe(false);
  });

  it("reads live process.env on each call (no module-load freeze)", () => {
    (process.env as Record<string, string>).NODE_ENV = "production";
    process.env.BASE_URL = "https://first.example.com";
    process.env.POSTHOG_HOST = "https://eu.i.posthog.com";
    expect(getRuntimeConfig().baseUrl).toBe("https://first.example.com");
    process.env.BASE_URL = "https://second.example.com";
    expect(getRuntimeConfig().baseUrl).toBe("https://second.example.com");
  });

  it("accepts NEXT_PUBLIC_BASE_URL as a fallback when BASE_URL is unset", () => {
    // Deploy-config contract: the shell reads the bare name first,
    // but tolerates the NEXT_PUBLIC_-prefixed variant so a Railway
    // service that follows the shell-docs convention still wires
    // through. See the readUrl fallback chain in runtime-config.ts.
    (process.env as Record<string, string>).NODE_ENV = "production";
    process.env.NEXT_PUBLIC_BASE_URL = "https://alt.example.com";
    // BASE_URL deliberately unset.
    const cfg = getRuntimeConfig();
    expect(cfg.baseUrl).toBe("https://alt.example.com");
  });

  it("BASE_URL takes precedence over NEXT_PUBLIC_BASE_URL when both set", () => {
    (process.env as Record<string, string>).NODE_ENV = "production";
    process.env.BASE_URL = "https://primary.example.com";
    process.env.NEXT_PUBLIC_BASE_URL = "https://alt.example.com";
    const cfg = getRuntimeConfig();
    expect(cfg.baseUrl).toBe("https://primary.example.com");
  });

  it("empty-string primary does not mask a set alternate (length-aware fallback)", () => {
    // A deliberately-empty BASE_URL must NOT win over a populated
    // NEXT_PUBLIC_BASE_URL. The prior `??` form treated `""` as
    // "set", masking the alternate; the length-aware form falls
    // through to the alternate when the primary is empty.
    (process.env as Record<string, string>).NODE_ENV = "production";
    process.env.BASE_URL = "";
    process.env.NEXT_PUBLIC_BASE_URL = "https://alt.example.com";
    const cfg = getRuntimeConfig();
    expect(cfg.baseUrl).toBe("https://alt.example.com");
  });

  it("accepts NEXT_PUBLIC_POSTHOG_HOST as a fallback when POSTHOG_HOST is unset", () => {
    (process.env as Record<string, string>).NODE_ENV = "production";
    process.env.NEXT_PUBLIC_POSTHOG_HOST = "https://alt-ph.example.com";
    process.env.BASE_URL = "https://shell.example.com";
    const cfg = getRuntimeConfig();
    expect(cfg.posthogHost).toBe("https://alt-ph.example.com");
  });

  it("getRuntimeConfigForMiddleware skips noStore() (Edge runtime path)", async () => {
    const cacheMod = await import("next/cache");
    const noStoreSpy = vi.spyOn(cacheMod, "unstable_noStore");
    (process.env as Record<string, string>).NODE_ENV = "production";
    process.env.BASE_URL = "https://edge.example.com";
    process.env.POSTHOG_HOST = "https://edge-posthog.example.com";

    const { getRuntimeConfigForMiddleware } = await import("./runtime-config");
    const cfg = getRuntimeConfigForMiddleware();
    expect(cfg.baseUrl).toBe("https://edge.example.com");
    expect(noStoreSpy).not.toHaveBeenCalled();

    // And confirm the default entrypoint DOES call noStore().
    noStoreSpy.mockClear();
    getRuntimeConfig();
    expect(noStoreSpy).toHaveBeenCalledTimes(1);
    noStoreSpy.mockRestore();
  });
});